| Mold to Olympia Heights (Florida) | 4,294.88 mi (6,911.95 km) |
| Mold to Omaha (Nebraska) | 4,123.15 mi (6,635.57 km) |
| Mold to On Top of the World Designated Place (Florida) | 4,200.74 mi (6,760.44 km) |
| Mold to Onalaska (Wisconsin) | 3,820.37 mi (6,148.29 km) |
| Mold to Oneida (New York) | 3,268.41 mi (5,259.99 km) |
| Mold to Oneonta (New York) | 3,272.02 mi (5,265.81 km) |
| Mold to Ontario (California) | 5,249.88 mi (8,448.86 km) |
| Mold to Ontario (Oregon) | 4,666.72 mi (7,510.36 km) |
| Mold to Opa-locka (Florida) | 4,282.34 mi (6,891.76 km) |
| Mold to Opelika (Alabama) | 4,145.36 mi (6,671.31 km) |
| Mold to Opelousas (Louisiana) | 4,519.92 mi (7,274.11 km) |
| Mold to Orange (California) | 5,270.28 mi (8,481.69 km) |
| Mold to Orange (Texas) | 4,606.61 mi (7,413.62 km) |
| Mold to Orange City (Florida) | 4,168.75 mi (6,708.95 km) |
| Mold to Orangeburg (South Carolina) | 3,922.96 mi (6,313.40 km) |
